Enable ACH origination on your Unit application and configure webhooks for `payment.returned` events.
For each returned payment event, capture the return reason code from the webhook payload.
Calculate your **unauthorized return rate** using codes R05, R07, R10, R29, and R51 over the preceding 60 days as a percentage of total ACH debits; the NACHA threshold is **0.5%**.
Calculate your **administrative return rate** using codes R02, R03, and R04 over the preceding 60 days; the NACHA threshold is **3.0%**.
Calculate your **overall return rate** using all return codes over the preceding 60 days; the NACHA threshold is **15%**. Alert your team if any rate approaches 80% of the respective threshold.
The calculation window is the **preceding 60 days**, not calendar month; use a rolling window in your monitoring logic.
R02 (account closed), R03 (no account), and R04 (invalid account) are administrative returns — they indicate data quality issues, not unauthorized transactions, and must be tracked separately from the unauthorized return bucket.
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